atmega168 xplained mini user guide (user guide)€¦ · 2. start the bootloader pc gui...

42250A-MCU-02/2014

USER GUIDE

ATmega168 Xplained Mini User Guide

Introduction

This user guide describes how to get started with the Atmel® ATmega168Xplained Mini board.The ATmega168 Xplained Mini evalutation kit is a hardware platform to evaluatethe Atmel ATmega168 microcontroller. The evaluation kit comes with a fullyintegrated debugger that provides seamless integration with Atmel Studio 6.2(and later version). The kit provides access to the features of the ATmega168enabling easy integration of the device in a custom design

ATmega168 Xplained Mini User Guide [USER GUIDE]42250A-MCU-02/2014

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Table of Contents

Introduction .................................................................................... 1

1. Getting Started ........................................................................ 31.1. Features .............................................................................. 31.2. Design Documentation and Related Links .................................. 31.3. Board Assembly .................................................................... 3

1.3.1. In Customer Development Assembly ............................. 31.3.2. Connecting an Arduino Shield ..................................... 31.3.3. Standalone Node ...................................................... 3

1.4. Connecting the Kit ................................................................. 31.4.1. Atmel Studio ............................................................ 31.4.2. Connect the ATmega168 UART to the mEBDG COM

Port ........................................................................ 31.5. Programming and Debugging .................................................. 3

1.5.1. Programming the Target Using mEDBG ......................... 31.5.2. Debugging the Target Using mEDBG ............................ 41.5.3. Programming the Target Using an External

Programmer ............................................................. 41.5.4. Programming the ATmega32U4 Using an External

Programmer ............................................................. 51.5.5. Bootloader ............................................................... 51.5.6. How to Install the "Bootloader PC tool" .......................... 6

1.6. Available Example Code ......................................................... 9

2. Hardware User Guide ........................................................... 102.1. Board Overview .................................................................. 102.2. Clock Distribution ................................................................. 102.3. Headers and Connectors ...................................................... 10

2.3.1. JTAG (J100) ........................................................... 102.3.2. USB (J101) ............................................................ 112.3.3. USART (J102) ........................................................ 112.3.4. ATmega168 Digital I/O (J200 and J201) ....................... 112.3.5. ATmega168 Analogue I/O (J203) ................................ 122.3.6. Power (J202) .......................................................... 122.3.7. ATmega168 ISP (J204) ............................................ 12

2.4. Board GUI .......................................................................... 132.4.1. LEDs ..................................................................... 132.4.2. Button ................................................................... 13

2.5. Factory Programmed Data .................................................... 13

3. Document Revision History ................................................... 14


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1. Getting Started

1.1 FeaturesThe ATmega168 Xplained Mini evaluation board provides a development platform for the Atmel ATmega168.

1.2 Design Documentation and Related LinksThe most relevant documents and software for the evaluation board.1

1.3 Board AssemblyThe Xplained Mini board is very flexible and can be used in a number of ways. E.g. as your own prototype forSW development and HW verification.

1.3.1 In Customer Development AssemblyThe ATmega168 Xplained Mini board can be wired into the customer prototype assembly by using the on-board connector grid, where most target signals are available.

1.3.2 Connecting an Arduino Shield

By assembling receptacles in the marked positions Arduino® shields can be mounted.

1.3.3 Standalone NodeThe ATmega168 Xplained Mini board can be used as a standalone node - use the 4xAAA battery packavailable in Atmel store to provide power.

1.4 Connecting the KitHow to connect the evaluation board.

1.4.1 Atmel StudioHow to connect the ATmega168 Xplained Mini board assembly to Atmel Studio.

1. Download and install Atmel Studio2 version 6.2 or newer.

2. Launch Atmel Studio.

3. Connect the board to the USB port and it will be visible in Atmel Studio.

1.4.2 Connect the ATmega168 UART to the mEBDG COM PortAll Xplained Mini boards have an embedded debugger (mEBDG) with a number of features, among them aCDC/COM port which enables the user to connect the ATmega168 UART to the PC.

1. Connect the mEDBG USB to the PC.

2. Use the Device Manager to find the COM port number.

3. Default COM port settings are 9600baud N81. The COM port settings can be changed using the DeviceManager.

1.5 Programming and DebuggingHow to program and debug the Xplained Mini board.

1.5.1 Programming the Target Using mEDBGUsing the Embedded Debugger on the Xplained Mini board to program the ATmeag168 via the SPI bus.

1 http://www.atmel.com/tools/XplainedMini.aspx2 http://www.atmel.com/tools/atmelstudio.aspx

http://www.atmel.com/tools/XplainedMini.aspx

http://www.atmel.com/tools/atmelstudio.aspx

http://www.atmel.com/tools/XplainedMini.aspx

http://www.atmel.com/tools/atmelstudio.aspx


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2. Go to Atmel Studio: Tools/Device Programming, and select the connected mEDBG as Tool with Device= ATmega168PA and Interface = ISP, click Apply. Note that if ISP programming fails it could be becausedebugWIRE is enabled. See debugging chapter on how to disable debugWIRE mode: “Debugging theTarget Using mEDBG” on page 4.

3. Select "Memories" and locate the source hex or elf file and click Program.

4. If the source contains fuse settings go to "Production file" and upload the elf file and program the fuses.

5. To set fuses manually click Fuses and select the setting.Recommended fuse setting:BOOTSZ = 1024W_1C00, BOOTRST = [ ], RSTDISBL = [ ], DWEN = [ ], SPIEN = [X], WDTON= [ ], EESAVE = [ ], BODLEVEL = DISABLE, CKDIV8 = [ ], CKOUT = [ ], SUT_CKSEL =EXTCLK_6CK_14CK_65MS

Important If any other cpu clk than the external clk supplied by the mEDBG is used the debugWIRE isnot guaranteed to work.The mEDBG will prevent writing certain fuse combinations in order to protect your kit.

1.5.2 Debugging the Target Using mEDBGUsing the Embedded Debugger on the Xplained Mini board to debug the ATmega168 via debugWIRE.

1. Start Atmel Studio.


3. Open your project.

4. In the Project menu select the project properties page, select the Tools tab and select mEDBG asdebugger and debugWIRE as interface.

5. In the Debug menu click Start Debugging and Break.

6. Atmel Studio will display an error message if the DWEN fuse in the ATmega168 is not enabled, click YESto make Studio set the fuse using the ISP interface.

7. A debug session is started with a break in main, debugging can start.

8. When exiting debug mode select "Disable debugWIRE and Close" in the Debug menu, this will disable theDWEN fuse.

Important If any other cpu clk than the external clk supplied by the mEDBG is used the debugWIRE is notguaranteed to work.

1.5.3 Programming the Target Using an External Programmer

How to program the target ATmega168 using the AVR® JTAGICE mkII, JTAGICE3, or other AtmelProgrammers.

1. Connect the External Programmer to the PC.

2. Connect the External Programme to the evaluation board connector (J204) (Need the 6-pin 100mil adapterconnected to the JTAGICE).

3. Go to Atmel Studio: Tools/Device Programming, and select the External Programmer connected as Tool,Select Device = ATmega168PA, Interface = ISP and click Apply.


5. If the source contains fuse settings go to "Production file" and upload the elf file and program the fuses.


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Recommended fuse setting:BOOTSZ = 1024W_1C00, BOOTRST = [ ], RSTDISBL = [ ], DWEN = [ ], SPIEN = [X], WDTON= [ ], EESAVE = [ ], BODLEVEL = DISABLE, CKDIV8 = [ ], CKOUT = [ ], SUT_CKSEL =EXTCLK_6CK_14CK_65MS

1.5.4 Programming the ATmega32U4 Using an External Programmer

How to program the ATmega32U4 using the AVR® JTAGICE mkII, JTAGICE3, or other Atmel Programmers.To restore the mEDBG FW use the /tools/mEDBG/mEDBG_fw.zip from the Studio installation.

1. Connect the External Programme to the PC.

2. Connect the External Programme to the board connector (J100).

3. Go to Atmel Studio: Tools/Device Programming, and select the External Programme connected as Tool,select Device = ATmega32U4, Interface = JTAG and click Apply.


5. If the source contain fuse settings go to "Production file" and upload the elf file and program the fuses.Recommended fuse setting:BODLEVEL = 3V5HWBE = [X]OCDEN = [ ]JTAGEN = [X]SPIEN = [X]WDTON = [ ]EESAVE = [X]BOOTSZ = 2048W_3800BOOTRST = [ ]CKDIV8 = [ ]CKOUT = [X]SUT_CKSEL = EXTXOSC_8MHZ_XX_258CK_65MS

Important CKOUT must be enabled the provide clock to the target.

1.5.5 BootloaderThis section describes how to use the bootloader to program the ATmega32U4.

1. Install the Bootloader interface on the PC as described in “How to Install the "Bootloader PCtool"” on page 6.

2. Start the Bootloader PC GUI "FLIP".

3. Short strap J102.Insert the USB stick in the PC.

4. Select Device = ATmega32U4 (Device - Select).

5. Select USB communication (Ctrl+U).

6. Select memory area to program (Use the toggle memory button bellow the Atmel logo).

7. Select Load Hex file (Ctrl+L).

8. Select Programming Options.

9. Click "Run", observe status in status field.


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1.5.6 How to Install the "Bootloader PC tool"

How to install the Bootloader PC GUI tool,

1. Download the Flip "in system programming tool" installer from http://www.atmel.com/tools/FLIP.aspx3.

2. Run the Flip Installer.

3 http://www.atmel.com/tools/FLIP.aspx

http://www.atmel.com/tools/FLIP.aspx

http://www.atmel.com/tools/FLIP.aspx


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3. Download the Atmel USB extension and run the installer.

4. Start Flip - if the USB stick is not recognized continue with step 5.

5. Update the USB DFU driver.


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Clik the Update Driver button and select "Browse my computer-..."


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1.6 Available Example CodeThe ATmega168 is preprogrammed with a demo program, ReMorse. Source code is available in AtmelSpaces4.When the CDC COM port is connected to a terminal window, the text you write will be transmitted via the LEDin Morse code.Any Morse code transmitted by using the switch will be displayed as text in the terminal window.

4 http://spaces.atmel.com/gf/

http://spaces.atmel.com/gf/




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2. Hardware User Guide

2.1 Board OverviewFigure 2-1. ATmega168XMINIoverview.png

2.2 Clock DistributionThe ATmega32U4 (mEDBG) has an external 16MHz XTAL.The ATmega32U4 provides an external 16MHz clock to the ATmega168 (target).

2.3 Headers and ConnectorsThe board connectors.

2.3.1 JTAG (J100)J100 is the JTAG programming header typically used by the JTAGICE for programming of the ATmega32U4(mEDBG).

Table 2-1. JTAG

J100 pin Signal function1 JTAG_TCK


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J100 pin Signal function2 GND

3 JTAG_TDO

4 VCC (5V0)

5 JTAG_TMS

6 RESET

7 NC

8 NC

9 JTAG_TDI

10 GND

2.3.2 USB (J101)J101 is a USB2.0 A PCB connector connecting the board to the PC.

Table 2-2. USB

J101 pin Function1 VBUS

2 D-

3 D+

4 GND

2.3.3 USART (J102)The ATmega32U4 UASRT signals are available on J102.

Table 2-3. J102 USART

J102 pin ATmega32U4 ATmega168 Function1 - UART TXD PD3 PD1 TxD from ATmega32U4

2 - UART RXD PD2 PD0 TxD from ATmega168

2.3.4 ATmega168 Digital I/O (J200 and J201)J200 and J201 provide access to ATmega168 digital I/O pins.

Table 2-4. J200

J200 pin & location ATmega168 pinJ200-1/ I11 PB0

J200-2 PB1

J200-3 PB2

J200-4 PB3

J200-5 PB4

J200-6 PB5

J200-7 GND

J200-8 AREF

J200-9 PC4

J200-10 PC5

Table 2-5. J201

J201 pin ATmega168 pinJ201-1 PD0


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J201 pin ATmega168 pinJ201-2 PD1

J201-3 PD2

J201-4 PD3

J201-5 PD4

J201-6 PD5

J201-7 PD6

J201-8 PD7

2.3.5 ATmega168 Analogue I/O (J203)

The ATmega168 analogue I/O pins are available in J203.

Table 2-6. J200

J200 pin & location ATmega168 pinJ200-1/ I11 PC0

J200-2 PC1

J200-3 PC2

J200-4 PC3

J200-5 PC4

J200-6 PC5

2.3.6 Power (J202)

The ATmega168 VCC and RESET is available in J202.

Table 2-7. J100 Xplained Pro Extension Header

J202 pin Description1 NC.

2 ATmega168 Vcc

3 RESET

4 NC

5 ATmega168 Vcc.

6 GND

7 GND

8 ATmega168 Vcc

2.3.7 ATmega168 ISP (J204)

J204 enable direct connection to ISP for programming of the ATmega168 or to use the SPI bus to connectexternal equipment.

Table 2-8. J204

J204 pin Function1 MISO

2 VCC target (ATmega168)

3 SCK

4 MOSI

5 RESET

6 GND


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2.4 Board GUI

2.4.1 LEDsThere are one LED available for use by application SW and one for the mEDBG.

Table 2-9. LEDs

LED FunctionD100 - Green mEDBG, will light during enumeration.

D200 - Yellow ATmega168 pin 17 - PB5, also connected to mEDBG SCK for ISP programming, in 3-statewhen not used.

.

2.4.2 ButtonA button is available for general use by application SW.

Table 2-10. Button

Button Function ATmega168 pinSW200 User defined high signal, press to ground

(negate).8 - PB7

2.5 Factory Programmed DataThe ATmega168 Xplained Mini board comes with a demo program preprogrammed in the ATmega168 FLASHusing the external clock provided by the ATmega32U4.The ATmega32U4 is preprogrammed with the mEDBG.


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3. Document Revision History

Documentrevision

Date Comment

42250A 01/2014 Initial document release

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